On Wed, 7 Dec 2005, Akim Demaille wrote:
"Joel" == Joel E Denny <[EMAIL PROTECTED]> writes:
> On Wed, 7 Dec 2005, Akim Demaille wrote:
>>>>> "Paul" == Paul Eggert <[EMAIL PROTECTED]> writes:
>>
>> > Why can't we simply rewrite the code so that it doesn't declare
>> > unused variables?
>>
>> Because you don't know whether yyerror, for instance, will use the
>> location, or the %parse-param. But some users need them there.
> But the user writes yyerror, and I don't believe YYUSE is documented for
> the user to invoke.
Right :) Consider the %printers and %destructors for instance.
In those cases, it also seems reasonable to leave it in the hands of the
user. That is, if the user doesn't reference a semantic value in its
printer or destructor, why did he declare its printer or destructor? Is
this a legitimate usage? Shouldn't he be warned *somehow*? Maybe even by
bison? Whether $$ occurs can be computed.
In general it seems that, as long as the interface for a passage of user
code is documented, any compiler or lint warnings for that code should be
the user's problem.
Note that I'm just talking philosophy here. I realize the implementation
of this might require an internal redesign, as Paul said.
Joel
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